Add callback function to track when camera starts recording

Author: leoneparise

LLSimpleCamera/LLSimpleCamera.h

@@ -48,6 +48,11 @@ typedef enum : NSUInteger {
  */
 @property (nonatomic, copy) void (^onError)(LLSimpleCamera *camera, NSError *error);
 
+/**
+ * Triggered when camera starts recording
+ */
+@property (nonatomic, copy) void (^onStartRecording)(LLSimpleCamera* camera);
+
 /**
  * Camera quality, set a constants prefixed with AVCaptureSessionPreset.
  * Make sure to call before calling -(void)initialize method, otherwise it would be late.

LLSimpleCamera/LLSimpleCamera.m

@@ -404,6 +404,7 @@ - (void)stopRecording:(void (^)(LLSimpleCamera *camera, NSURL *outputFileUrl, NS
 - (void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections
 {
     self.recording = YES;
+    if(self.onStartRecording) self.onStartRecording(self);
 }
 
 - (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error